This bubble chart maps GDP against life expectancy for various countries, with bubble size reflecting population and color indicating country. The visualization uses D3 v6 to render an SVG, employing `d3.scaleLinear` for both axes and `d3.scaleSqrt` for bubble radii. Data is loaded from a CSV file via `d3.csv`, which also populates a manual legend. Axes are generated with `d3.axisBottom` and `d3.axisLeft`, and all chart elements—including the title and axis labels—are appended as SVG elements.